SRAM XX1 BB30 11-Speed Crankset without Ring New tooth profile alternates thickness by inner and outer links, providing maximum chain control Carbon arms with forged aluminum spider Weight: 650 grams with ring and BB(approx.) - BB and ring not included Must be used in conjunction with SRAM's XX1 complete group (rear derailleur, cassette, shifter, chain, cranks/chainrings) Chain ring not included, chain ring bolts are included; Rings are 76BCD